Originally Posted by
Dovo1695
It looks like a really nice example of an Iwasaki Western Swedish Carbon Steel Razor that's been nicely re-handled. I don't know a lot about the carbon steel ones, but I do know that they are very well regarded as exceptional razors. They're less sought after than the tamahagane ones by collectors, but many would argue that's really only due to the relative scarcity of the tamahagane one's, not due to a significant performance difference or craftsmanship.
I can't see the Kanji well enough in the pic, but if it has an "M" on it, that stands for medium hardness. These were hardened to 775-795 Vickers (63 Rockwell) rather than the 800-820 Vickers (64+ Rockwell) that the standard carbon steel Western razors were. This was done to make them easier to sharpen, and were marketed to the growing number of female barbers in the postwar period. They tend to be a bit shorter as well which also makes them easier to hone.